Pull the underground drain which is often a black corrugated plastic pipe away from the end of the downspout.
Bypass my in ground gutter drain.
You can also hire a professional to tap into an underground drainage system if you have one installed on your.
Check to see if water and debris come out the other end of the pipe.
Remove the guard at the other end of the drain pipe if there is one.
The water simply drains into the ground at the end of the underground downspouts.
Turn on a garden hose to its most powerful setting and run water through the drain pipe.
Another quick tip when installing the underground gutter extension tubing is to use lots of perforated pipe once you re away from the house so the water can drain as it moves down the tube.
Disconnect the gutter downspout from where it connects to the drain pipe.
To do this i cut the black corrugated pipe added a t and aimed the pipe upwards to the downspout.
Letting some of the water drain into the ground as it moves down the pipe keeps the total amount of water at the end lower which means less chance of.
Since my in ground pipe ran right past the garage i had the garage downspout dump in as well.